<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>更新时的一个问题</title>
    <script src="../js/vue.js"></script>
  </head>
  <body>
    <div id="root">
      <h2>人员列表</h2>
      <button @click="updateMei">点击按钮更新马冬梅的信息</button>
      <ul>
        <li v-for="(p,index) in persons" :key="p.id">
          {{p.name}}-{{p.age}}-{{p.sex}}
        </li>
      </ul>
    </div>

    <script>
      Vue.config.productionTip = false;

      const vm = new Vue({
        el: "#root",
        data: {
          persons: [
            { id: "001", name: "马冬梅", age: 30, sex: "女" },
            { id: "002", name: "周冬雨", age: 44, sex: "女" },
            { id: "003", name: "周杰伦", age: 18, sex: "男" },
            { id: "004", name: "温兆伦", age: 19, sex: "男" },
          ],
        },
        methods: {
          updateMei() {
            // this.persons[0].name = "马老师";//奏效
            // this.persons[0].age = 50;//奏效
            // this.persons[0].sex = "男";//奏效

            // this.persons[0] = { id: "001", name: "马老师", age: 50, sex: "男" };//不奏效

            this.persons.splice(0, 1, {
              id: "001",
              name: "马老师",
              age: 50,
              sex: "男",
            });
          },
        },
      });
    </script>
  </body>
</html>
